Author: delphij
Date: Sun Jun 25 06:55:42 2017
New Revision: 320326
URL: https://svnweb.freebsd.org/changeset/base/320326
Log:
MFC r320216: Fix use-after-free introduced in r300388.
In r300388, endnetconfig() was called on nc_handle which would release
the associated netconfig structure, which means tmpnconf->nc_netid
would be a use-after-free.
Solve this by doing endnetconfig() in return paths instead.
Reported by: jemalloc via kevlo
Reviewed by: cem, ngie (earlier version)
Modified:
stable/9/lib/libc/rpc/rpcb_clnt.c
Directory Properties:
stable/9/lib/libc/ (props changed)
Modified: stable/9/lib/libc/rpc/rpcb_clnt.c
==============================================================================
--- stable/9/lib/libc/rpc/rpcb_clnt.c Sun Jun 25 05:46:03 2017
(r320325)
+++ stable/9/lib/libc/rpc/rpcb_clnt.c Sun Jun 25 06:55:42 2017
(r320326)
@@ -508,14 +508,15 @@ try_nconf:
hostname = IN6_LOCALHOST_STRING;
}
}
- endnetconfig(nc_handle);
if (tmpnconf == NULL) {
+ endnetconfig(nc_handle);
rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
mutex_unlock(&loopnconf_lock);
return (NULL);
}
loopnconf = getnetconfigent(tmpnconf->nc_netid);
/* loopnconf is never freed */
+ endnetconfig(nc_handle);
}
mutex_unlock(&loopnconf_lock);
client = getclnthandle(hostname, loopnconf, NULL);
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